Voyager 1September 5, 1977

Voyager 1 begins it 18-month journey for its
first planetary encounter: Jupiter. Its mission, along with Voyager
2, is to investigate the atmospheres, magnetospheres, satellites,
and ring systems of Jupiter and Saturn.

As of 2002, 25 years after launch, Voyager
1 is the farthest human-made spacecraft in the universe. Both Voyagers
send back data from their distant locations well beyond Pluto once
a week.